In the short term，the plan provides an ideal way to global warming，although the term was actually concerned with a much greater danger.The Sun is certain to heap up in about a billion years and seriously compromise our biosphere (生物圈)—by cooking us.

　　That’s why the group decided to try to save Earth.

　　The plan has one or two worrying aspects，though.For a start，space engineers would have to be very careful about how they directed their asteroid or comet towards Earth.The smallest miscalculation in orbit could fire it straight at Earth—with deadly consequences.

　　There is also the question of the Moon.As the current issue of Scientific American points out，if Earth was pushed out of its current position，it is most likely that Moon would be stripped away from Earth.This would greatly change our planet’s climate.

　　【文章大意】　本文是一篇科普文，介绍了科学家们的一个关于移动地球的设想。

　　1．What makes the scientists plan to move Earth?

　　A．A few comets are moving to the direction of Earth.

　　B．Earth’s working life is coming to an end soon.

　　C．Earth will become too hot for mankind to keep alive.

　　D．The moon is moving farther and farther away from Earth.

　　解析：选C。细节理解题。根据第一段的第一句可知C项正确。

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